Water Rocket Forum

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A water rocket is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is constructed from thin plastic or other non metallic materials (usually a used plastic soft drink bottle) weighing 1,500 grams or less. The water is forced out by compressed air. It is an example of Newton's third law of motion.

Hi, I am building my rocket, and read the rules yesterday. I have a question.

My deployment consists of a chip and battery and a motor, this motor powers the mechanism that releases the parachute. Now, I have got this chip and battery and motor from an old model plane, and I tought it would be good to use it for my parachute deployment system. But my question is if this is allowed, because I get confused with it when I read the rules.

Willem wrote:Hi, I am building my rocket, and read the rules yesterday. I have a question.

My deployment consists of a chip and battery and a motor, this motor powers the mechanism that releases the parachute. Now, I have got this chip and battery and motor from an old model plane, and I tought it would be good to use it for my parachute deployment system. But my question is if this is allowed, because I get confused with it when I read the rules.

Thanks in advance,
Willem

That system would be allowed under the rules. Recently the rules were amended to also allow the use of commercially manufactured deployment servo controlling timers which is similar to the device you are making.

Lisa Walker,Forum Administrator. The Water Rocket Achievement World Record Association

Willem wrote:Hi, I am building my rocket, and read the rules yesterday. I have a question.

My deployment consists of a chip and battery and a motor, this motor powers the mechanism that releases the parachute. Now, I have got this chip and battery and motor from an old model plane, and I tought it would be good to use it for my parachute deployment system. But my question is if this is allowed, because I get confused with it when I read the rules.

Thanks in advance,
Willem

Does the deploy work with a radio control or did you figure out a way to delay the parachute deploy based on when the rocket takes off? Either way is cool, and many people use this type of deploy successfully. Good luck!

Willem wrote:I already abandoned this system, I am now making a completely different rocket out of fiberglass, and I will be using the piston ejection system Air Commandrockets also made. I hope it will work!

What will you be using to trigger the system? If you are interested in a low cost solution we can provide you plans for a servo operated deploy that is only a few grams. The design is a lightweight variation of our ServoChron 2 controller plans that is a bit heavier but requires a lot less work to fabricate.